Who Cites discrete equality?
discrete_equality	Def {T=} == {eq:(TT)| x,y:T. (eq(x,y)) x = y }
	Thm* T:Type. {T=} Type
disjoint	Def disjoint(eq;L1;L2) == xL1.x(eq) L2
	Thm* T:Type, eq:(TT), L1,L2:T List. disjoint(eq;L1;L2) Type
assert	Def b == if b True else False fi
	Thm* b:. b Prop
is_member	Def x(eq) L == (letrec is_member x eq L = (Case of L; nil false ; h.t if eq(x,h) true else is_member(x,eq,t) fi) ) (x,eq,L)
	Thm* T:Type, eq:(TT), u:T. u(eq) nil
	Thm* T:Type, eq:(TT), x:T, L:T List. x(eq) L
not	Def A == A False
	Thm* A:Prop. (A) Prop
iff	Def P Q == (P Q) & (P Q)
	Thm* A,B:Prop. (A B) Prop
bnot	Def b == if b false else true fi
	Thm* b:. b
list_all	Def xL.P(x) == (letrec list_all L = (Case of L; nil True ; h.t P(h) & list_all(t)) ) (L)
	Thm* T:Type, P:(TProp), L:T List. xL.P(x) Type
	Thm* T:Type, P:(TType). xnil.P(x) Type
letrec_body	Def = b == b
letrec_arg	Def x b(x) (x) == b(x)
letrec	Def (letrec f b(f)) == b((letrec f b(f)) ) (recursive)
rev_implies	Def P Q == Q P
	Thm* A,B:Prop. (A B) Prop

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